Industrial sewing machine bearings are also lubricated with grease, and there are no special requirements for oil and water resistance. The axial size of the ring seal groove (the axial position of the seal groove) has a great influence. Comparing the groove contact seal structure in Fig.1. Therefore, the interference between the sealing ring lip and the inner ring sealing groove of this structure has a large dispersion. 2 for motorcycle engine case bearings. 1 to Fig. 1 is that the inner ring of the bearing does not have a seal groove and the sealing route is short, which is not conducive to sealing. Therefore, the requirements for the anti-leakage sealing performance of this type of bearing are very high, and the bearing must adopt a contact seal structure.

According to the different sealing materials, they are mainly divided into two types: rubber sealing ring and dust cover (standard iron cover): according to different seals, they can be divided into contact sealing and non-contacting seal. 4, the difference is that the structure of Fig. For sealed deep groove ball bearings such as motorcycles, home appliances motors, luxury ceiling fans, etc. Therefore, the sealing performance of the non-contact dust cover sealing structure of FIG. For example, the sealing grooves of precision low-pitched automotive bearings produced by some domestic bearing manufacturers are grinded with a shaped grinding wheel, which greatly improves the processing accuracy of the sealing groove and the accuracy of matching with the sealing ring, so that the sealing performance of the bearing

The quality of vibration and noise has been significantly improved. 5 uses a dust cover. At the same time, due to the better roughness of the outer diameter grinding of the inner ring, the friction torque of the bearing under the same sealing effect is smaller than that of the groove contact seal structure in Figure 1. For example, a single-sided sealed motorcycle engine case bearing is lubricated by splash lubrication by the engine oil in the engine when the engine is working. The sealing ring lip either has too little contact deformation, which affects the sealing effect, or the contact deformation is too large, increasing the contact surface The frictional torque and bearing rotating torque caused the vibration and noise to increase and the temperature rise too high and too fast when the bearing was working.

Since this structure requires high processing precision of the sealing ring and the sealing groove of the ferrule, and high production cost, it has not been widely adopted. 2 has the following four advantages: (1) The inner ring does not have a sealing Mechanical ball bearing manufacturers groove, so the processing cost is lower; (2) The sealing ring lip With the grinding inner and outer diameters, the interference is smaller; (3) The friction torque is smaller under the same sealing effect; (4) Under the same friction torque and the same oil pressure on the inner side of the sealing ring, the sealing ring lip The contact surface with the inner ring is not easy to separate, which is very advantageous for the sealing under pressure on the inside of the bearing seal ring.

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